Synthesized answer
The provided passages do not explicitly state the central thesis of "My Brief History" by Stephen Hawking.
However, the passages do indicate that the book is "the story of his life in his own words" and is "expanded from a lecture of the same name" [1]. The description also highlights Stephen Hawking as a "brilliant cosmologist" and author of a bestselling book, suggesting the narrative might touch upon his scientific contributions and personal experiences [1]. What the central thesis of his life story might be, however, is not detailed in these excerpts.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: My Brief History by Stephen Hawking Description: Stephen Hawking is one of the most brilliant cosmologists of our time, and author of the 10 million copy bestselling A Brief History of Time, one of the iconic books of its generation. Now, for the first time, he tells the story of his life in his own words, in a book expanded from a lecture of the same name.